Scientific References

Peer Reviewed Literature: Novel Materials for Combined Nitrogen Dioxide and Formaldehyde Pollution Control under Ambient Conditions

Authors Hugo S. Russell 1,2,3,4 , James Bonomaully 2, Rossana Bossi 4, Magdalena E. G. Hofmann 5 ,
Hasse C. Knap 2 , Jakob B. Pernov 1,4 , Marten in ‘t Veld 1 and Matthew S. Johnson 1,2,*
1 Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark; [email protected] (H.S.R.); [email protected] (J.B.P.);
[email protected] (M.i.V.)
2 AirLabs Denmark, Nannasgade 28, DK-2200 København N, Denmark; [email protected] (J.B.); [email protected] (H.C.K.)
3 Danish Big Data Centre for Environment and Health (BERTHA), Aarhus University, DK-4000 Roskilde, Denmark
4 Department of Environmental Science, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark; [email protected]
5 Picarro B.V.,Willemsplein 2, NL-5211 AK ’s-Hertogenbosch, The Netherlands; [email protected]
* Correspondence: [email protected]; Tel.: +45-3532-0300
Presented at
https://www.mdpi.com/2073-4344/10/9/1040
Date September 10th, 2020

Abstract

Formaldehyde (HCHO) and nitrogen dioxide (NO2) often co-exist in urban environments at levels that are hazardous to health. There is a demand for a solution to the problem of their combined removal. In this paper, we investigate catalysts, adsorbents and composites for their removal effciency (RE) toward HCHO and NO2, in the context of creating a pollution control device (PCD). Proton-transfer-reaction mass spectrometry and cavity ring-down spectrometry are used to measure HCHO, and chemiluminescence and absorbance-based monitors for NO2. Commercially available and lab-synthesized materials are tested under relevant conditions. None of the commercial adsorbents are effective for HCHO removal, whereas two metal oxide-based catalysts are highly effective, with REs of 81 + or - 4% and 82 + or - 1%, an improvement on previous materials tested under similar conditions. The best performing material for combined removal is a novel composite consisting of a noble metal catalyst supported on a metal oxide, combined with a treated active carbon adsorbent. The composite is theorized to work synergistically to physisorb and oxidize HCHO and chemisorb NO2. It has an HCHO RE of 72 + or - 2% and an NO2 RE of 96 + or - 2%. This material has potential as the active component in PCDs used to reduce personal pollution exposure.